Updated to support dotnet8

Terminal.Gui/Terminal.Gui.csproj

@@ -20,7 +20,7 @@
     <DebugType>portable</DebugType>
   </PropertyGroup>
   <PropertyGroup>
-    <TargetFrameworks>net472;netstandard2.1;net7.0</TargetFrameworks>
+    <TargetFrameworks>net472;netstandard2.1;net8.0</TargetFrameworks>
     <RootNamespace>Terminal.Gui</RootNamespace>
     <AssemblyName>Terminal.Gui</AssemblyName>
     <SuppressNETCoreSdkPreviewMessage>true</SuppressNETCoreSdkPreviewMessage>

UICatalog/UICatalog.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <LangVersion>9.0</LangVersion>
     <StartupObject>UICatalog.UICatalogApp</StartupObject>
     <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>

UnitTests/UnitTests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <!-- https://stackoverflow.com/questions/294216/why-does-c-sharp-forbid-generic-attribute-types -->
     <!-- for AutoInitShutdown attribute -->
     <LangVersion>Preview</LangVersion>

global.json

@@ -1,6 +1,6 @@
 {
   "sdk":{
-    "version":"7.0.200",
+    "version":"8.0.204",
     "rollForward":"latestMinor"
   }
 }